inseparable companion; inevitable part; something that always comes with
Refers to something that naturally or unavoidably accompanies another thing, often with a slightly negative or resigned nuance. Sense 1 (natural accompaniment) and sense 2 (inevitable aspect) are closely related and merged here.
Effort is an inseparable part of success.
Risk is something that inevitably comes with starting something new.
supplementary insert; appendix; obi strip
Refers to an extra printed item included with a book or magazine, such as an appendix, booklet, or the paper band (obi) wrapped around a book cover.
This magazine comes with a supplementary insert in every issue.
An obi strip is wrapped around the book as an accompaniment.
Usually written in kana; the kanji spelling 付き物 is also common.
Common kanji spelling, especially in formal or written contexts.
Search-only kanji form; rarely used in practice.
Mixed kana-kanji spelling; less common but seen.
Compound of 付き (tsuki, continuative form of 付く 'to attach') + 物 (mono 'thing'). Literally 'attached thing', it came to mean something that naturally accompanies or is inseparable from something else.