Definition of bite one's lip in English:

bite one's lip

Repress an emotion; stifle laughter or repress a retort: she bit her lip to stop the rush of bitter words
More example sentences
  • Ashley felt the beginning of a smile, and she bit her lip.
  • She bit her lip; suddenly realizing she'd used the term "amazing" a lot since arriving in London.
  • I bit my lip and forced myself to be calm.
See parent entry: bite

Definition of bite one's lip in:

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Word of the day retroflex
Pronunciation: ˈrɛtrə(ʊ)flɛks
adjective
turned backwards