Expressions (phrases, clauses, etc.), Ichidan verb
to take advantage (e.g. of a weak situation); to size up (e.g. customer when setting a high price)
Idiomatic expressionfrom palanquin bearers gauging how weary a traveler's feet are, and raising the price accordingly
人に足下を見られるなよ。Don't let anyone take advantage of you.
Also written 足下を見る【あしもとをみる】、足もとを見る【あしもとをみる】