To glance or look sideways (dialectal/archaic), or a sidelong glance or glimpse.
Related to glint and possibly Middle Low German glinsen; it appears in Northern English and Scots dialect. The word emphasizes a sidelong or furtive nature of looking.
Words like 'glinse' and 'glink' show how English dialects developed specialized vocabulary for subtle distinctions—a direct look, a glance, a glinse, and a glimpse all mean slightly different things about *how* you're looking.
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