怠る

(1)fail to do something; leave something undone; "She failed to notice that her child was no longer in his crib"; "The secretary failed to call the customer and the company lost the account"

(2)ある事をしない

(3)何かを放っておく

(1)She failed to notice that her child was no longer in his crib

(2)彼女は、子供がもう彼のベビーベッドにいなかったのに気付かなかった

(3)The secretary failed to call the customer and the company lost the account

(4)その秘書が、顧客に電話をするのを忘れたために、会社は得意先を失った