فاعل doer in Arabic
فاعل is how you say “doer” in Arabic.
Arabic
English
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Example sentence
والمتدفق المطلوع لفعل الفاعل
And "mutadaffiq" is attributed to the action of the doer.
الفَاعِلِ the doer
An active participle made definite by al-, 'the doer / agent', the owning second noun of 'the action of the doer', hence the genitive. This is the grammatical term for the one who performs the action, the fa'il.
The English is machine-translated.

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More example sentences
والدافق قيل إنه فاعل بمعنى مفعول كقولهم سر كاتم وعيشة راضية
And it is said that "dafiq" is an active participle with the meaning of a passive, like their saying "sir katim" and "ʿīsha rāḍiya."
فَاعِلٌ active participle
The grammatical term 'active participle' (the fa'il form), here an indefinite predicate: 'it is an active participle'. The claim is that this word has the form of a doer-noun even though, as the next words say, it carries a passive sense.
وقيل وهو الصواب إنه اسم فاعل على بابه
And it is said, and this is correct, that it is an active participle in its original sense.
فَاعِلٍ participle
An active participle 'doer' in the genitive, the owned second noun of 'noun of the doer'. Together the pairing is the technical name for the fa'il form; here it completes 'it is an active participle'.
ولا يلزم من ذلك أن يكون هو فاعل الدفق
And it is not required that he be the performer of the pouring.
فَاعِلَ the performer
An agent noun 'doer of' in the object-style ending because it is the predicate of the 'to be' verb, which puts its predicate into the accusative-style ending. It heads a possessive pairing with 'the pouring' after it: 'the doer of the pouring'.
فإن اسم الفاعل هو من قام به الفعل سواء فعله هو أو غيره
For an active participle is one by whom the action is carried out, whether he performed it himself or someone else did.
الفَاعِلِ of the active
An active participle 'the doer' made definite by al-, the owned second noun of 'noun of the doer', in the genitive. The pairing is the technical name for the fa'il form being defined.