Pull out all the stops, hallmark, make peace,

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Pull out all the stops

Meaning
Make every possible effort.
Origin
The popular belief is that this phrase derives from the manner of construction of pipe organs. These instruments have have stops to control the air flow through the pipes and pulling them out increases the musical volume. This seems to be the type of casual easy answer that is the hallmark of folk etymology. In this case, the popular belief isn't a fallacy but is in fact correct.
Prior to the introduction of pipe organs the word 'stop' had, in a musical context, been used to mean 'note' or 'key'. That usage is recorded as early as the late 16th century, as in this example from George Gascoigne's satire The Steele Glas, 1576:

"But sweeter soundes, of concorde, peace, and loue, Are out of tune, and iarre in euery stoppe."

Of course, 'notes' and 'keys' can't be pulled out. The word 'stop' later came to be used for the knobs that control the flow of air in pipe organs, by pushing them in or, more to the point here, pulling them out.
The first person to have used the phrase in a figurative, i.e. non-organ related, sense appears to have been Matthew Arnold, in Essays in Criticism, 1865:

"Knowing how unpopular a task one is undertaking when one tries to pull out a few more stops in that... somewhat narrow-toned organ, the modern Englishman."

stop━━ n. 止める［止まる］こと, 中止, 休止; 停留所; 妨害（物）; 【機】止め具; つめ; 滞在; 終止; 句読点 (a full 〜 ピリオド）; 【楽】（オルガンの）ストップ, 音栓(せん); 【写】絞り; 【音声】閉鎖音 ((, , ; , , など)).

Pull out all the stops
Use all the resources or force at one's disposal, as in The police pulled out all the stops to find the thief. This term comes from organ-playing, where it means "bring into play every rank of pipes," thereby creating the fullest possible sound. It has been used figuratively since about 1860.

make (one's) peace

• re-establish friendly relations:he returned to the village to make peace with his mother

hállmàrk[háll・màrk]

レベル：社会人必須

[名]

1 （貴金属の）純度検証極印；品質証明, 太鼓判, 折り紙.

2 特質, 特徴.

3 ((H-))米国のグリーティングカード（会社）.

━━[動](他)…に（純度検証の）極印を押す；…の品質を保証する, …に折り紙をつける.

［Goldsmiths' CompanyがあったLondonのGoldsmith's Hallから. ここで貴金属の純度保証の印がつけられた］

háll・màrk・er

[名]