見掛ける
みかける · mikakeru · JLPT N3 · verb-ichidan
to catch sight of
👀 見掛ける = see (見る) + hang/catch (掛ける): your eyes catch on something
見 means see and 掛ける means hang or hook onto. Together they describe your gaze catching on something in passing. You weren't looking for it, you just happened to see it.