The phrase "swallow in" is correct and usable in written English.
It is often used to mean to take in or absorb something. For example: "He swallowed in the knowledge as the professor lectured."
Another surprise was the appeal of the cast-bronze insects at Swallow, in Brooklyn.
Reported to Thornton Burgess she saw large bullfrog with barn swallow in mouth.
That is a bitter pill to swallow in 2013," Brenda Emmanus concluded.
If, however, the prey is too large to swallow in one bite, it is ripped into chunks.
Each dancer mirrored her counterpart in perfect symmetry; the pairs were so connected that they seemed to swallow in synch.
"Funny how seeing someone swallow in their sleep, lying next to you, can bring a lump to your throat.
That central theme of the "X-Files" mythology is certainly hard to swallow in the real world.
This is tough for Germany to swallow, in large part because of the memories of the 1923 hyper-inflation.
Whatever Davis said, hard-boiled Brexit is difficult to swallow in SW1, even among pro-leave Tory MPs.
There may be hard truths for the President to swallow in the coming months but his bold action in Mali suggests he has finally regained his appetite.
That story line presumed that corporate titans were not just greedy and murderous but also brainy, and that's a bit much to swallow in the current economy.
