Definition of "fill in the blank" in English

Noun

1. A language exercise in which one or more words are replaced with a blank line and the reader is tasked with supplying a valid replacement.

   • The test consisted of fill-in-the-blank sentences.

2. A placeholder allowing for any of a variety of possible answers or a single elicited answer.

Verb

1. To complete a single fill in the blank question.

2. To complete an interruption, ambiguity, or vagueness in understanding, perception, or context.