被約 is read as ひやく (hiyaku) and means reduced.
ひやく
hiyaku
かぶる
to be deceived
ひこく
defendant
ひがい
(suffering) damage
ひしゃたい
(photographic) subject
ひふく
clothing
ひこくにん
accused
ひがいしゃ
victim
ひばく
being bombed
かぶせる
to cover (with something)
ひぎしゃ
suspect
ひけんしゃ
examinee (of a full-body scan, etc.)
かぶりもの
(novelty) mask