agog
adj., adv.
"in a state of desire; in a state of imagination; heated with the notion of some enjoyment; longing" [Johnson], c.1400, perhaps from Old French en gogues "in jest, good humor, joyfulness," from gogue "fun," which is of unknown origin.
词根：agog = lead, 表示“引导”
demagogue n. 煽动者（dem人民+agogue→引导肉民者→煽动者）
pedagoue n. 教师（ped儿童+agogue→引导儿童者→教师）
agog a. 渴望的，热心的（引导人往前走的心情→渴望的）