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We found 19 dictionaries with English definitions that include the word suck up:
Click on the first link on a line below to go directly to a page where "suck up" is defined.

General (15 matching dictionaries)

1. suck-up: Merriam-Webster.com [home, info]
2. suck-up, suck up: Oxford Dictionaries [home, info]
3. suck up: Vocabulary.com [home, info]
4. suck up: Macmillan Dictionary [home, info]
5. suck-up: Wordnik [home, info]
6. suck-up, suck up: Wiktionary [home, info]
7. suck-up, suck up: Dictionary.com [home, info]
8. suck up: Rhymezone [home, info]
9. suck up: Free Dictionary [home, info]
10. suck up: Mnemonic Dictionary [home, info]
11. suck up: WordNet 1.7 Vocabulary Helper [home, info]
12. suck up: LookWAYup Translating Dictionary/Thesaurus [home, info]
13. suck-up, suck up: Dictionary/thesaurus [home, info]

Computing (1 matching dictionary)

14. suck up: Encyclopedia [home, info]

Miscellaneous (1 matching dictionary)

15. suck up: Idioms [home, info]

Slang (2 matching dictionaries)

16. suck up: English slang and colloquialisms used in the United Kingdom [home, info]
17. suck-up: Urban Dictionary [home, info]

(Note: See suck_ups for more definitions.)

Quick definitions from WordNet (suck up) ▸ verb:  take in, also metaphorically ▸ verb:  ingratiate oneself to; often with insincere behavior ▸ verb:  try to gain favor by cringing or flattering ▸ Also see suck_ups ▸ Words similar to suck up ▸ Usage examples for suck up ▸ Words that often appear near suck up ▸ Rhymes of suck up ▸ Invented words related to suck up