absent / stopped

(decapitated cow) + (sword) + (rice field)
★★☆☆☆
10 strokes
DUPECOCKJERK
COCK: not only is the KUNyomi a DUPE, but the very common jukugo (留守) is an FP as well. It's almost like this kanji is trying to be baffling in as many ways as possible ON PURPOSE.

Onyomi

RYUU

You'll have to REUSE that phone to call me later - I'm away from home right now.

Mnemonic

The cow's head is away - it was chopped off with a sword and then hidden in a rice field. Kids these days.

Kunyomi

( ) と*まる Here's the DUPE part: DICTIONARIES say  留まる, along with 止まる, both mean 'to stop something.' Luckily 留まる is never used, so you don't have to worry about confusing it with 止まる.
☆☆☆☆☆
( ) とど*まる it doesn't move or expand (crime rate doesn't change / the jerkface politician remains in office / the damage is limited to this)
★★☆☆☆

Jukugo

留学生(りゅうがくせい)

student studying abroad ★★★★☆
(absent / stopped) + (student) = 留学生 (student studying abroad )

留守(るす)

be away ★★☆☆☆ FP
(absent / stopped) + (protect) = 留守 (be away)

to be away from home; to be absent (留守番電話 (るすばんでんわ)= leave a message at the tone)

Synonyms

arrest
逮捕    投獄    拘留する    拘束する   
set aside, store
蓄える    蓄積    貯める    留まってきた    滞る    重なる    積み重ねる   
stop
止まる    留まる