YOU SAID:
the man walked up the hill and slipped and fell down it
INTO JAPANESE
男は丘を上って滑って転んだ。
BACK INTO ENGLISH
The man slipped up the hill and fell.
INTO JAPANESE
男は丘を滑り降りて転んだ。
BACK INTO ENGLISH
The man slipped down the hill and fell.
INTO JAPANESE
男は丘を滑り降りて転んだ。
BACK INTO ENGLISH
The man slipped down the hill and fell.
That didn't even make that much sense in English.