Correct spelling for the English word "sinkler" is [sˈɪŋklə], [sˈɪŋklə], [s_ˈɪ_ŋ_k_l_ə] (IPA phonetic alphabet).
There seems to be no widely recognized etymology for the word "sinkler". It is possible that the term "sinkler" may be a variant or misspelling of another word. Without additional context or information, it is challenging to determine the specific origins or meaning of the term you mentioned.