The man was right - he could feel his strength ebbing.
His strength had ebbed, until even standing was an effort.
He used to be able to do twice that many, but his strength was slowly ebbing.
His strength ebbing fast, he pulled himself up over the side of the boat.
Their last strength of mind and body was swiftly ebbing.
It was hard to concentrate, and he could feel his strength ebbing once more.
Luckily the big man's strength had ebbed so that he could control him.
The mountains seemed no closer, but his strength was ebbing.
For three days he had flown in battle, and his strength was ebbing fast.
His strength ebbed, and he died in very short order, mourned by exactly no one.