走失

走失	zǒu shī	to wander off; to get lost
走	zǒu	to walk / to go / to run / to move (of vehicle) / to visit / to leave / to go away / to die (euph.) / from / through / away (in compound verbs, such as 撤走) / to change (shape, form, meaning)
失	shī	to lose / to miss / to fail