相決あいじゃくり

あ

い

じゃ

く

り

Meanings

half lap joint between parallel boards

A woodworking joint where the edges of two parallel boards are notched to overlap, creating a flush surface. Technical carpentry term.

床ゆか板いたをあいじゃくりで接せつ合ごうすると、隙すき間まができにくい。
When you join floorboards with a half lap joint, gaps are less likely to appear.
この棚たなの側そく板ばんは相あい決じゃくりで組くまれている。
The side panels of this shelf are assembled with half lap joints.

Kanji

相inter-, mutual, together
決decide, fix, agree upon
合fit, suit, join

Related words

相あい欠がき
相欠き is a similar half-lap joint but typically used for crossing members, while 相決り is specifically for parallel boards.
本ほん実ざね
本実 is a tongue-and-groove joint, which also joins parallel boards but uses a different profile than the notched overlap of 相決り.

Built from

相あい+しゃくる

Written forms

相決あいじゃくり
Standard kanji spelling for this carpentry term.
合決あいじゃくり
Variant spelling using 合 instead of 相.
合決あいじゃくり
Abbreviated spelling; less common.
相決あいじゃくり
Abbreviated spelling; less common.

Etymology

Compound of 相 (ai, 'mutual') and 決り (jakuri, 'notch, groove'), referring to the interlocking nature of the joint. The exact historical derivation is uncertain, but the term is established in traditional Japanese carpentry.