early-morning visit to a temple or shrine
Refers to the practice of visiting a temple or shrine early in the morning, often for prayer or a specific ritual.
正月には朝参りをする人が多い。
Many people make early-morning shrine visits during the New Year.
Compound of 朝 (asa, 'morning') and 参り (mairi, 'visiting a shrine/temple', the noun form of 参る).