毎度
まいど · maido · JLPT N2 · adverb
each time
毎 (every) + 度 (occasion) = each time; a shop greeting, thanks for every visit
Shopkeepers use it as a polite thank-you each time a customer returns. The full phrase is 毎度ありがとうございます (maido arigatou gozaimasu), thank you every time.
度 — 广 (shelter) + 庶 abbreviated (phonetic)
Originally depicted a hand measuring length under a shelter, meaning 'to measure' or 'a measure/standard.' From this came extended senses like 'degree,' 'extent,' and 'to pass through' (as in passing time). The reading 'dù' means degree/measure, while 'duó' preserves the older verbal sense of measuring.