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Answer variants:
Stray dog
Grunt
Grateful
Wrestling
1.
 \(=\) A sport in which two people fight and try to throw each other to the ground
 
2.
 \(=\) Of a person to make a short, low sound instead of speaking, usually because of pain
 
3
 \(=\) A pet that no longer has a home or cannot find its home
 
4
 \(=\) Feeling or showing an appreciation for something done or received