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to be jealous of; to envy; to begrudge
「嫉む」 has another reading with different meanings.
他人の成功を嫉むより自分の努力に集中すべきだ。
Rather than envying others' success, you should focus on your own efforts.
嫉む気持ちを抑えて素直に祝福することにした。
I suppressed my feelings of jealousy and decided to offer sincere congratulations.
同僚の昇進を嫉んでいる自分が情けなくなった。
I felt ashamed of myself for envying my colleague's promotion.