凹入

凹入	āo rù	recessed / concave
凹	āo	concave; depressed; sunken; indented; female (connector etc)
凹	wā	variant of 洼 / (used in names)
入	rù	to enter; to go into / to join; to become a member of / (bound form) to conform to (as in 入时) / abbr. for 入声 / (on product packaging, after {number n} + {classifier}) containing (n pieces) (from Japanese 入 "iri")