I watch them glide.
Meaning: This sentence describes the speaker's observation of the birds, which is that they are moving smoothly and effortlessly through the air.
Choice of Words: Watch means to look at something intently. Glide means to move smoothly and effortlessly through the air. When you put them together, "I watch them glide" means that I am looking at the birds as they move smoothly and effortlessly through the air.
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Related Expressions