合がっ点てん承しょう知ち之の助すけ

Meanings

Colloquial, somewhat old-fashioned or jocular phrase used to acknowledge understanding and willingness to take on a task. Often heard in period dramas or used playfully.

「この荷に物もつを運はこんでくれ」「合がっ点てん承しょう知ち之の助すけ！」
"Carry this luggage for me." "Got it, leave it to me!"
彼かれはいつも「合がっ点てん承しょう知ち之の助すけ」と元げん気きよく返へん事じをする。
He always replies cheerfully with "Got it, roger!"

Kanji

合fit, suit, join
点spot, point, mark
承acquiesce, hear, listen to
知know, wisdom
之of, this
助help, rescue, assist

Related words

承しょう知ち
承知 is a standard word for 'knowing' or 'consenting'; 合点承知之助 is a playful, colloquial phrase built around it.
合が点てん
合点 means 'understanding' or 'consent' and is part of the phrase; 合点承知之助 is a fixed expression, not used as a regular compound.

Written forms

合がっ点てん承しょう知ち之の助すけ
Standard kanji spelling for this colloquial phrase.
合がっ点てん承しょう知ちの助すけ
Variant with の in place of 之; same meaning.
がってん承しょう知ち之の助すけ
Mixed kana-kanji spelling; がってん is written in kana.
がってん承しょう知ちの助すけ
Mixed kana-kanji spelling with の.

Etymology

A colloquial phrase combining 合点 (understanding) and 承知 (knowing/consent) with the old-fashioned male name suffix 之助 (のすけ), creating a playful, emphatic 'understood!' expression.