To look down on someone; to underestimate others. Literally describes looking at a person through a narrow crack in a door, which makes them appear thin and small. Often used as a two-part allegorical saying ([[歇后语|歇後語|xie1 hou4 yu3]]) completed by the phrase [[把人看扁|把人看扁|ba3 ren2 kan4 bian3]].