sniff
verb /snɪf/
  /snɪf/
Verb Forms
Idioms Phrasal Verbs| present simple I / you / we / they sniff |  /snɪf/  /snɪf/ | 
| he / she / it sniffs |  /snɪfs/  /snɪfs/ | 
| past simple sniffed |  /snɪft/  /snɪft/ | 
| past participle sniffed |  /snɪft/  /snɪft/ | 
| -ing form sniffing |  /ˈsnɪfɪŋ/  /ˈsnɪfɪŋ/ | 
- [intransitive] to breathe air in through your nose in a way that makes a sound, especially when you are crying, have a cold, etc.- We all had colds and couldn't stop sniffing and sneezing.
- She sniffed a little and dabbed at her eyes.
 Extra Examples- The woman sniffed back her tears.
- He sniffed loudly and continued to weep.
- She sniffed and wiped her nose with a tissue.
 Oxford Collocations Dictionaryadverb- loudly
- deeply
- a little
- …
 - at
 
- [transitive, intransitive] to breathe air in through the nose in order to discover or enjoy the smell of something synonym smell- sniff something sniffing the fresh morning air
- to sniff glue
- sniff (at something) The dog sniffed at my shoes.
- He sniffed appreciatively. ‘Smells delicious. What is it?’
 Oxford Collocations Dictionaryadverb- loudly
- deeply
- a little
- …
 - at
 
- [transitive, intransitive] + speech | sniff (something) to say something in a way that shows that you are annoyed, unhappy or not satisfied or that you do not approve of somebody/something- ‘It's hardly what I'd call elegant,’ she sniffed.
 
Word OriginMiddle English: imitative.
Idioms 
not to be sniffed/sneezed at 
- (informal) good enough to be accepted or considered seriously- In those days, $20 was not a sum to be sniffed at.