everyday use; daily use
Refers to using something regularly in daily life, as opposed to special occasions.
This bag is perfect for everyday use.
I like simple tableware for daily use.
普段 is an adverb/noun meaning 'usual' or 'ordinarily'; 普段使い is the noun form specifically for 'everyday use' of an item.
Similar meaning, but 日常使い may sound slightly more formal or written.
Standard kanji spelling.
Rarely used kanji form; 不断 can also be read ふだん, but this spelling is uncommon.
Compound of 普段 (ふだん, 'usual, everyday') and 使い (づかい, 'use, usage'). The reading づかい is a rendaku form of つかい.