Synonym: 5, Little Phoebe, Phoebe, V, break water, cinque, five, fivesome, flipper, louver, louvre, pentad, quint, quintet, quintuplet, tail fin, tailfin. Similar words: find, fine, fined, finis, offing, coffin, final, finger. Meaning: [fɪn] 
n. 1. the cardinal number that is the sum of four and one 2. one of a pair of decorations projecting above the rear fenders of an automobile 3. one of a set of parallel slats in a door or window to admit air and reject rain 4. a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater) 5. a stabilizer on a ship that resembles the fin of a fish 6. organ of locomotion and balance in fishes and some other aquatic animals. v. 1. equip (a car) with fins 2. propel oneself through the water in a finning motion 3. show the fins above the water while swimming.
n. 1. the cardinal number that is the sum of four and one 2. one of a pair of decorations projecting above the rear fenders of an automobile 3. one of a set of parallel slats in a door or window to admit air and reject rain 4. a shoe for swimming; the paddle-like front is an aid in swimming (especially underwater) 5. a stabilizer on a ship that resembles the fin of a fish 6. organ of locomotion and balance in fishes and some other aquatic animals. v. 1. equip (a car) with fins 2. propel oneself through the water in a finning motion 3. show the fins above the water while swimming. 
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1. Tip us your fin.
2. We could see the fin of a shark as it slowly circled our boat.
3. The aircraft has a long tail fin.
4. Something like a fin protruded from the water.
5. The dorsal fin is ornamented with these two colours.
6. Note the downturned wingtips and large ventral fin.
7. The eye-spotted dorsal fin is another distinctive feature.
8. The blennies have a single dorsal fin, which may be almost, but not completely, divided by a deep notch.
9. The dorsal fin is like a yacht sail; tall and similarly shaped.
10. The storekeepers paid Mr. B. a fin a week, and he refrained from smashing up their equipment.
10. Wish you can benefit from our online sentence dictionary and make progress every day!
11. It was a very odd fin, and why was the creature swimming so slowly?
12. Both the four eye and spot fin have a posterior eye spot.
13. Butterflyfish have a spiny dorsal fin, which they are quite prepared to use in attack.
14. It has no tail fin like those of other fish, merely a fleshy stump.
15. I mean the whole, blue-green ball of fur, fin, feathers.
16. The caudal fin is yellow-brown, and the dorsal spine and long snout are orange.
17. Adult males have a humped forehead and longer fin extensions, but there is no obvious way of sexing smaller individuals.
18. Fortunately, Chrysler dropped the idea for such a fin at the last minute.
19. The numbers of humpback and fin whales had undergone similar increases.
20. Use two coats, rubbing down with fin abrasive paper between.
21. These are powerfully developed and, with the caudal fin, achieve a swift forward thrust.
22. The male fish develops extended filaments on the dorsal fin.
23. There is nothing clown-like at all about a pale pink fish with a light stripe along the base of the dorsal fin.
24. The male is larger and has a more pointed dorsal fin.
25. However it is easily identified by the large black blotch that covers a large proportion of its upper body and dorsal fin.
26. The two spines are the first rays of each pectoral fin.
27. It has a wide space between it and the tiny, second dorsal fin.
28. It is a uniform bright yellow and has a large lyre-shaped caudal fin.
29. This system also permits a very low centre of gravity for the total fin profile.
30. The trigger, which gives the fish its name, is the leading ray of its dorsal fin which has become bony.