shine; sparkle
輝く(かがやく)、光輝(こうき)
to shine, brilliance
On-reading (キ) is used in compounds; kun-reading (かがや(く)) 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.
彼女の才能___、いかなる舞台でも輝けるはずだ。
Answer: をもってすれば
この名優は輝く___輝き、半世紀以上にわたって舞台に立ち続けた。
Answer: べくして