From Longman Dictionary of Contemporary Englishbe stuck for somethingbe stuck for somethingto be unable to think what to say or do For once Anthony was stuck for words (=did not know what to say). → stuck
Examples from the Corpus
be stuck for something• Most of what they accused him of was true, and Wyden was stuck for an answer.• I was stuck for an answer.• Antony for once was stuck for words. 