keep one's ears open

keep one's ears open (third-person singular simple present keeps one's ears open, present participle keeping one's ears open, simple past and past participle kept one's ears open)

1. (figuratively, idiomatic) to listen for important information.

• keep an ear to the ground
• keep a weather eye open
• keep one's eyes peeled
• lend an ear
• prick up one's ears
• strain one's ears

• “keep your ears open” (US) / “keep your ears open” (UK) in Macmillan English Dictionary.
• “keep your ears open” in Longman Dictionary of Contemporary English, Longman.
• “keep your eyes ears open” in Longman Dictionary of Contemporary English, Longman.