退 (Kanji for retreat)

Onyomi

TAI

It's good to retreat from society and move to THAIland (if you are in NAMBLA).

( に　or まで or を ) しりぞ*く

withdraw (from competition, troops withdraw from the Gaza strip, sometimes also means retire).
★★★☆☆

から退院(たいいん) する

to be released from the hospital ★★★☆☆
退 (retreat) + 院 (institution) = 退院 (to be released from the hospital)

退屈(たいくつ) な

boring ★★★☆☆ 1/2 KANA
退 (retreat) + 屈 (yield, get out of the way) = 退屈 (boring)

boring!（verb form : 退屈した： "It was boring!"）