Looking angrily or threateningly at someone with a frown; staring with disapproval or resentment.
From Middle English 'louren' (to frown), possibly related to Old Norse 'lūra' (to lurk or crouch). The 'g' prefix may be a variant or dialectal addition. The word evolved to mean a sustained, angry stare.
A glower is more than just anger—it's a sustained stare that communicates rage without words, which is why it appears so often in literature to show a character's simmering resentment before they explode.
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