Reach high branches.
Meaning: This means that giraffes can touch or grasp high branches with their long necks. It's like saying, Giraffes can extend their necks to access branches located at a great distance from the ground.
Choice of Words: Reach means to stretch out or extend your arm or body in order to touch or grasp something. High means located at a great distance from the ground. Branches are the parts of a tree that grow out from the trunk. In this sentence, the giraffes are reaching high branches with their long necks.
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Related Expressions