先さきに

〈人ひと〉より先さきに〈動どう詞し〉to do something ahead of someone else
彼かれはライバルより先さきにゴールした。
He reached the finish line before his rival.
先さきに〈動どう詞し〉ておくto do something in advance/beforehand
会かい議ぎの前まえに、先さきに資し料りょうを用よう意いしておいた。
I prepared the materials in advance before the meeting.
お先さきにどうぞplease go ahead (of me)
お先さきにどうぞ、私わたしは後あとで行いきます。
Please go ahead, I'll go later.
先さきに〜、その後あとで〜to do one thing first, then another afterward
先さきに宿しゅく題だいを終おわらせて、その後あとでゲームをする。
I'll finish my homework first and play games afterward.

Expressions· 8

口くちから先さきに生うまれるto be a chatterbox from birth; to be born talking
一ひと足あし先さきにahead of others; slightly earlier; before someone else
先さきに立たつlead; take the initiative · take precedence; come first · be most essential; be paramount
先さきに通とおすlet someone go first; let someone pass ahead
先さきに進すすめるproceed with; continue with; move forward with

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前まえもってN2sense 3
前もって stresses formal preparation done ahead of time, while 先に can also simply mean 'first' or 'earlier' in a sequence without that preparatory nuance.
あらかじめN2sense 3
あらかじめ is a slightly more formal, written word for 'in advance,' whereas 先に is common in everyday speech and covers more meanings (first, earlier, beforehand).
以い前ぜんN3sense 1
以前 is a noun meaning 'before' or 'previous' and is often used as 以前に, while 先に is an adverb and cannot function as a noun.
先さきほどN2sense 1
先ほど refers specifically to 'a little while ago' and sounds more polite, while 先に covers a broader range of past time as well as 'first' and 'beforehand.'

後あとでN5
先に means 'beforehand/first', the opposite of 後で which means 'afterwards/later'.
後あとから
後から means 'afterwards' or 'later,' whereas 先に means 'beforehand' or 'ahead of time.'

お先さきにN2
先に is the plain, everyday word for 'before/first', while お先に adds the honorific prefix お to sound politer, as when excusing oneself before others.

From 先 (さき, 'ahead, before') + adverbial particle に. The kanji 先 is conventionally associated with 'before' or 'ahead'.

neither before nor after; no other time; the only time