be bad at ones sums ne demek?

Türk alfabesinin ikinci harfinin adı, okunuşu.
"Ey, hey, yahu" anlamlarında bir seslenme sözü
Berilyum elementinin simgesi.
To live; to happen; to exist.
To exist actually, or in the world of fact; to have existence.
To exist in a certain manner or relation, whether as a reality or as a product of thought; to exist as the subject of a certain predicate, that is, as having a certain attribute, or as belonging to a certain sort, or as identical with what is specified, a word or words for the predicate being annexed; as, to be happy; to be here; to be large, or strong; to be an animal; to be a hero; to be a nonentity; three and two are five; annihilation is the cessation of existence; that is the man.
To take place; to happen; as, the meeting was on Thursday.
To signify; to represent or symbolize; to answer to.
Prefix, originally the same word as by; To intensify the meaning; as, bespatter, bestir.
To render an intransitive verb transitive; as, befall ; bespeak.

Rüzgâr
"Olsun, ola, olaydı" manasına gelir ve kelimelerin sonuna getirilir. Mesela: Aferin bad $ : Aferin olsun. Çok yaşa. Afiyet bad $ : Afiyet olsun. (Osmanlıca'da yazılışı: bâd)
Kesmek. Yarmak.
Zaman zarfıdır ve te'hir ifade eder. (Osmanlıca'da yazılışı: ba'd)
(worse,worst) kötü, nahoş
Değersiz
Kifayetsiz
Yanlış, kusurlu
Geçersiz
Bozuk, zararlı

Satrançta, her yönde siyahtan beyaza ve beyazdan siyaha bir hane atlayarak L biçiminde hareket eden taş.
Astatin elementinin simgesi.
Atgillerden, binme, yük çekme, taşıma vb. hizmetlerde kullanılan, tek tırnaklı hayvan.
Tek parmaklılar (Perissodactyla) takımının,atgiller (Equidae) familyasından, küçük başlı ve kısa kulaklı, uzun kıllı yele ve kuyruğu olan, geniş bir tırnakla çevrilmiş olan üçüncü parmağının ucu ile yere basan, bütün dünyaya yayılmış, erkeğine aygır, dişisine kısrak denilen bir tür.
Zoolojik sınıflandırmada Equidae ailesinin equus cinsinden olan at türüne verilen genel ad, hippos.
Relation of proximity to, or of presence in or on, something; as, at the door; at your shop; at home; at school; at hand; at sea and on land.
The relation of some state or condition; as, at war; at peace; at ease; at your service; at fault; at liberty; at risk; at disadvantage.
The relation of some employment or action; occupied with; as, at engraving; at husbandry; at play; at work; at meat ; except at puns.
The relations of time, age, or order; as, at ten o'clock; at twenty-one; at once; at first.
The relations of source, occasion, reason, consequence, or effect; as, at the sight; at this news; merry at anything; at this declaration; at his command; to demand, require, receive, deserve, endure at your hands.