bend; yield
理屈（りくつ）、屈む（かがむ）
logic, to crouch
On-reading (クツ) is used in compounds; kun-reading (かが(む)) is used standalone or with okurigana. This kanji forms verbs/adjectives with okurigana. Practice both the word form and compound forms.
From the JLP Quiz question bank — the word in the form it is actually tested in.
「不撓不屈」の意味はどれか。
Answer: 困難にめげず意志を曲げないこと
「退屈」の読み方は？
Answer: たいくつ
