inflect

Short definition from Wiktionary

Verb

1. 1
   To cause to curve inwards.
2. 2
   To change the tone or pitch of the voice when speaking or singing.
3. 3
   To vary the form of a word to express tense, gender, number, mood, etc.
4. 4
   To be varied in the form to express tense, gender, number, mood, etc.