Annual meadow grass

I have several patches over my lawn of what I believe is annual meadow grass. What is the best way to try and remove this as I assume it will only get worse if left with seeding.

 

For any patches of unwanted coarse grasses in the lawn we use a razor sharp thin blade knife and just slash it repeatedly, a lot of it will just come away and it will stuggle to come back , if it does, just repeat.

 

I'd forgotten about the slash and dash! ta for the reminder

 

Thank you for this. I have a knife so now a job for the weekend