あたま 頭がさえる Show inflections LinksSentence search for 頭がさえるSentence search for あたまがさえるSentence search for 頭が冴えるKanji details for 頭Edit in JMdict Expressions (phrases, clauses, etc.), Ichidan verb1. to be clear-headedoften 頭が冴えたコーヒーをいっぱい一杯の飲むと頭が冴える。I feel more alert after drinking a cup of coffee.Other forms頭が冴える 【あたまがさえる】 Discussions Log in to talk about this word.