OET interlinear EXO 8:17

uW Translation Notes:

וַ⁠יֵּט֩ אַהֲרֹ֨ן אֶת־יָד֤⁠וֹ בְ⁠מַטֵּ֨⁠הוּ֙ וַ⁠יַּךְ֙ אֶת־עֲפַ֣ר הָ⁠אָ֔רֶץ

(Some words not found in UHB: and,they_did so and,he_stretched_out ʼAhₐron DOM his/its=hand with,staff_of,his and,he_struck DOM dust_of the=earth/land and=it_became the,gnat[s] on,humankind and=on/over=cattle/livestock all/each/any/every dust_of the=earth/land it_became gnats in=all earth/land Miʦrayim/(Egypt) )

Again, this is one action or motion, but it is described with the two verbs, stretched and struck, that occur throughout this section of plague judgment. See how you translated it in the previous verse.

אֶת־יָד֤⁠וֹ בְ⁠מַטֵּ֨⁠הוּ֙

DOM his/its=hand DOM (Some words not found in UHB: and,they_did so and,he_stretched_out ʼAhₐron DOM his/its=hand with,staff_of,his and,he_struck DOM dust_of the=earth/land and=it_became the,gnat[s] on,humankind and=on/over=cattle/livestock all/each/any/every dust_of the=earth/land it_became gnats in=all earth/land Miʦrayim/(Egypt) )

See note in the Chapter 8 Introduction regarding the hand and staff.

Note 1 topic: translate-unknown

הַ⁠כִּנָּ֔ם & כִנִּ֖ים

(Some words not found in UHB: and,they_did so and,he_stretched_out ʼAhₐron DOM his/its=hand with,staff_of,his and,he_struck DOM dust_of the=earth/land and=it_became the,gnat[s] on,humankind and=on/over=cattle/livestock all/each/any/every dust_of the=earth/land it_became gnats in=all earth/land Miʦrayim/(Egypt) )

Again, we do not know what this term refers to for certain, so see how you translated it in 8:16.

Note 2 topic: figures-of-speech / gendernotations

בָּ⁠אָדָ֖ם

(Some words not found in UHB: and,they_did so and,he_stretched_out ʼAhₐron DOM his/its=hand with,staff_of,his and,he_struck DOM dust_of the=earth/land and=it_became the,gnat[s] on,humankind and=on/over=cattle/livestock all/each/any/every dust_of the=earth/land it_became gnats in=all earth/land Miʦrayim/(Egypt) )

Here man includes women and children. Alternate translation: [people] or [mankind] or [humans] See the UST.

Note 3 topic: figures-of-speech / hyperbole

כָּל־עֲפַ֥ר הָ⁠אָ֛רֶץ & בְּ⁠כָל־אֶ֥רֶץ מִצְרָֽיִם

(Some words not found in UHB: and,they_did so and,he_stretched_out ʼAhₐron DOM his/its=hand with,staff_of,his and,he_struck DOM dust_of the=earth/land and=it_became the,gnat[s] on,humankind and=on/over=cattle/livestock all/each/any/every dust_of the=earth/land it_became gnats in=all earth/land Miʦrayim/(Egypt) )

This extraordinary statement with the repeated all is used to emphasize the extent and severity of the plague. If this would be unnatural in your language use a natural way to communicate that.