A primitive root (rather identical with 'azan through the idea of scales as if two ears); to weigh, i.e. (figuratively) ponder -- give good head.
see HEBREW 'azan
H239. azan
II. [אָזַן] verb only
Pi`el Perfect weigh, test, prove (compare Arabic weigh, also Arabic & Aramaic derivatives); וְּאִזֵּן (conj.) Ecclesiastes 12:9 ("" תִּקֵּן חִקֵּר,).
אזן (√ of following; Biblical Hebrew מאֹזְנַיִם אזן,).