āĻ āύā§āϏāύā§āϧāĻžāύ āĻāϰā§āύ
āĻ āĻāĻŋāϧāĻžāύā§āϰ āĻāĻžāώāĻž āύāĻŋāϰā§āĻŦāĻžāĻāύ āĻāϰā§āύ
āĻāĻĒāύāĻžāϰ āĻāĻžāώāĻž āύāĻŋāϰā§āĻŦāĻžāĻāύ āĻāϰā§āύ
to know one's stuff
to know one's stuff
01
to be very knowledgeable about or skillful in a particular field of work
Idiom
Informal
āĻāĻĻāĻžāĻšāϰāĻŖ
When it comes to astronomy, Professor Smith really knows his stuff.



























