泊 (Kanji for stay for the night)

Onyomi

HAKU

Make the white devils spend the night in a wet puddle. (This inn is Japanese only! )

( に ) と＊まる	to stay somewhere overnight ★★★☆☆
( を ) と＊める	to let your friends crash at your house. ☆☆☆☆☆

一泊(いっぱく)

one night's stay ★☆☆☆☆ COUNTER
一 (one) + 泊 (stay for the night) = 一泊 (one night's stay)

a COUNTER for the number of nights you stay. You use this when making a reservation at a hotel. Ippaku is , of course, one night.

二泊(にはく)

to stay somewhere for two nights. ★☆☆☆☆
二 (two) + 泊 (stay for the night) = 二泊 (to stay somewhere for two nights.)

に宿泊(しゅくはく) する

stay the night ☆☆☆☆☆ NP
宿 (lodge at) + 泊 (stay for the night) = 宿泊 (stay the night)

the act of staying the night -(kind of formal; you might read it in a hotel guidebook, but you wouldn't say "Let's 宿泊 over there, guys!"