Synonym: baggy, droopy, dull, hanging, inactive, lax, lazy, loose, slow. Antonym: tight. Similar words: slacken, lack, black, flack, lackey, blacken, lacking, black out. Meaning: [slæk] 
n. 1. dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve 2. a noticeable deterioration in performance or quality 3. a stretch of water without current or movement 4. a soft wet area of low-lying land that sinks underfoot 5. the condition of being loose (not taut) 6. a cord or rope or cable that is hanging loosely. v. 1. avoid responsibilities and work, be idle 2. be inattentive to, or neglect 3. release tension on 4. make less active or fast 5. become slow or slower 6. make less active or intense 7. become less in amount or intensity 8. cause to heat and crumble by treatment with water. adj. 1. not tense or taut 2. lacking in strength or firmness or resilience 3. flowing with little speed as e.g. at the turning of the tide 4. lacking in rigor or strictness.
n. 1. dust consisting of a mixture of small coal fragments and coal dust and dirt that sifts out when coal is passed over a sieve 2. a noticeable deterioration in performance or quality 3. a stretch of water without current or movement 4. a soft wet area of low-lying land that sinks underfoot 5. the condition of being loose (not taut) 6. a cord or rope or cable that is hanging loosely. v. 1. avoid responsibilities and work, be idle 2. be inattentive to, or neglect 3. release tension on 4. make less active or fast 5. become slow or slower 6. make less active or intense 7. become less in amount or intensity 8. cause to heat and crumble by treatment with water. adj. 1. not tense or taut 2. lacking in strength or firmness or resilience 3. flowing with little speed as e.g. at the turning of the tide 4. lacking in rigor or strictness. 
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151. It's time to slack up a bit.
152. I'm gonna enjoy killin'these slack - jawed daffodils!
153. Look busy while you slack off or play games.
154. The snow didn't slack off for 36 hours.
155. Slack seasons and wretchedness were unknown.
156. Slack up before you reach the cross - roads.
157. Singleton female easy and capricious, selfish, slack, feebleminded wait.
158. Conduit ageing is slack, it is moment was updated.
159. The early autumn was lustreless and slack.
160. Coal slack is one of industrial waste residues.
161. I share these writers' impatience with slack novelistic convention.
162. The boat is slack in stays.
163. Do not slack off in your studies.
164. For parallel connection by ports of linear, time-invariant and initial slack multi-terminal networks, the effect on network transfer function is analyzed by using indefinite admittance matrix.
165. These materials can not be pretensioned to avoid the slack condition resulting from asymmetrical loadings.
166. Back-Adjusting algorithm makes use of slack time of among nodes to optimize system design still further.
167. Transform the problem into the canonical form ( equality constraints ) by adding slack or surplus variables.
168. The hybrid sturgeon in cement pool had the habit of hiding during the day and coming out at night,(http://sentencedict.com/slack.html) while that in deep water cage stayed at the base in riptide and swam in slack tide.
169. Winter was the slack season at most hotels except here.
170. If you're in management, any slack time you give a talented employee to pursue an idea is a mini "genius grant."
171. Using the optimization results to make the index of separation system(sentencedict.com), the rae of clean coal can be improved more greatly than changing the washing rate of slack coal and screening slack coal.
172. By improving slack adjuster, this paper adjusts the runing working condition of conveyor belt tension, reduces running trouble of conveyor belt, satisfieds manufacture require.
173. Weakened muscles, slack skins, and senility are common to us.
174. Draw of body shell , crimp in foot fall, Unable diction , get feel painful to nothing slack transpierce psychical !
175. At present, horizontal vibrating centrifuge and vertical scraping centrifuge are usually used for common centrifuge of slack coal in coal preparation plant.
176. A lot of people like to be on the balcony pisciculture of cistern of build by laying bricks or stones, but many cistern had appeared slack circumstance.
177. The innovation and effect analysis of slack coal separation system technology was introduced in Fangezhuang Coal Mine Co. branch, and some questions in the innovation were suggested.
178. Actually, many students slack off during the projects and barely slip by.
179. As soon as you start to slack off, their satisfaction and motivation decreases.
180. A scheduling algorithm based on combining slack time and value is presented in this paper.
More similar words: slacken, lack, black, flack, lackey, blacken, lacking, black out, for lack of, blackleg, blacking, jet black, blackball, black hand, black hole, in the black, black list, black sheep, blackbody, blackface, blackmail, blacklist, blackness, lacklustre, blacksmith, lackluster, a black sheep, blackberry, black magic, black horse.