This is the 1222nd most frequent Turkish word.
aksi
"Opposite" or "contrary."
Here, "aksi halde" means "otherwise" or "if not" and is used to depict a conditional outcome if the stated condition was not met.
Bugün hava çok güzel aksi halde dışarı çıkmazdım.
The weather is very nice today, otherwise I wouldn't have gone out.
In this sentence, "aksi" refers to someone being contrary or having an opposing or defiant manner.
Onun aksi davranışlarından pek hoşlanmıyorum.
I do not really like his contrary behavior.
Here, "aksi gitmek" means "to go wrong" or "to take a bad turn," describing a series of unfavorable events.