expression
quick-eared; sharp-eared; first to hear
Describes someone who hears news or gossip very quickly, often before others. The expression is usually used in the form 耳が早い.
See also: 耳の早い
彼は耳が早いから、もう知っているかもしれない。
He's quick-eared, so he might already know.
Tanaka-san has sharp ears and is always the first to catch information.