Synonym: clean up, neaten, roll out, square away, straighten out, tidy, tidy up, unbend. Similar words: tighten, fighter, strain, constraint, highlight, daughter, trail, trait. Meaning: ['streɪtn] 
v. 1. straighten up or out; make straight 2. make straight 3. get up from a sitting or slouching position 4. put (things or places) in order 5. straighten by unrolling 6. make straight or straighter.
v. 1. straighten up or out; make straight 2. make straight 3. get up from a sitting or slouching position 4. put (things or places) in order 5. straighten by unrolling 6. make straight or straighter. 
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1 Straighten your back - try not to slouch.
2 We employed a lawyer to straighten our legal tangle.
3 Can you straighten your leg?
4 Help me to straighten the wall clock.
5 I subvert the whole world just to straighten your reflection.
6 Would you straighten that picture over there? - It's a bit cockeyed.
7 Straighten up your room.
8 He would make an appointment with him to straighten out a couple of things.
9 I subvert the entire world,(www.Sentencedict.com) only to straighten out your reflection.
10 I was left to straighten out the mess.
11 Dear,straighten yourself up. Let's go out for supper.
12 Straighten him out; he perhaps misunderstood what I said.
13 Pepe was careful to straighten his room before leaving.
14 Straighten both legs until they are fully extended.
15 I need time to straighten out my finances.
16 Mum told me to straighten my room.
17 Maybe religion should help to straighten him out.
18 Could you straighten out these cupboards, please?
19 Let's try to straighten out this confusion.
20 You should straighten up your ideas first.
21 First, straighten your legs, then flex your feet.
22 You'd better straighten up or else!
23 The road will straighten after bypassing the hill.
24 He's trying to straighten out his finances.
25 Straighten up slowly, then repeat the exercise ten times.
26 You'd better straighten up, young lady!
27 Straighten the rivets, please.
28 She had plastic surgery on her nose to straighten it.
29 Mark and I managed to straighten up the house before our parents got home.
30 If she showed any tendency to coquetry he would be apt to straighten her tie, or if she "took up" with him at all, to call her by her first name.