as one would expect from; given that; because
Expresses that a result is natural or expected considering the preceding noun or clause. Often used with a nuance of 'precisely because'.
彼はプロだけに、さすがの腕前だ。
As you'd expect from a pro, his skill is impressive.
precisely because; all the more because
Used when an unexpected or ironic result occurs precisely because of the stated reason. Often followed by a negative or surprising outcome.
好きなだけに、嫌いになったときの反動が大きい。
Precisely because I liked it, the backlash when I started to hate it was huge.
on account of; being what it is
Used in the pattern ＡがＡだけに to emphasize that the very nature of A leads to a certain outcome, often with a sense of inevitability.
only to; only for; only in
A less common usage combining だけ (only) with に (particle), meaning 'only to/for/in'. Not the same as the conjunction だけに. See also だけ.
See also: だけ
この部屋は男性だけに入室が許されている。
Entry is permitted only to men in this room.
この店は人気があるだけに、予約が取りにくい。
Given that this restaurant is popular, it's hard to get a reservation.
期待が大きかっただけに、失望も大きかった。
All the more because expectations were high, the disappointment was great.
This problem, being what it is, cannot be solved easily.
彼が彼だけに、誰も反対できなかった。
On account of him being who he is, no one could oppose him.
That service is provided only to members.
だけ is a particle meaning 'only' or 'just'. だけに is a conjunction/expression meaning 'precisely because' or 'as expected from', except for sense 4 where it is だけ + に.
ばかりに also means 'precisely because', but often implies a negative result and is used with verbs in the past tense. だけに can be used with nouns and adjectives more broadly.
Derived from the particle だけ (only, extent) combined with the particle に. The conjunction usage developed from the idea of 'to the extent that' or 'just because'.