ショウ, て.る, て.らす, て.れる, あき, てる
illuminate, shine, compare, bashful
JLPT2 G4 S13 F1004
昭# brightness + 火 fire (for emphasis/clarification) → *shine on*; *illuminate* → *reflect*. Also, *inquire* and *compare* (← make inquiry by shining a light on separate objects and comparing them), as well as *shy/self-conscious* (← shrink at having a light shone on one).
[Full Kanji Etymology List]