as time went by不是短语，went by是短语。
went by
读音：英 [went baɪ] 美 [went baɪ]
释义：时间逝去，从…旁经过，依照。
基本意思是“离开原来的地方向别处挪动”。引申可表示“去,走,旅行,前进”“离开,离去”“死,垮,坏”“放弃,消失,停止存在”“处于…状态”“流行,流传,流通”“发生,进展,变成,变为”。
“运行,运转,起作用,走动”“遵照…行动”“放置,装入,纳入”“响,发音,报钟点”“流逝,消逝,走过,经过”“归,落入…手”“诸”“总共,合成”“通到,延伸至”“花费”“卖,卖得…价”“有节奏,与曲调相配”“称为,叫作,冒名”“有,备有”“招惹”等意思。
同根词组：
abide by 遵守，履行。
adopt by acclamation 通过口头表决方式通过。
brush by 触到，擦及。
carry by acclamation 通过口头表决方式通过。
catch sb by surprise 使某人吃惊，使惊异，使感到意外。
characterize by 以…为特征。
clap sb by the heels 给某人上镣铐。
come by （尤指通过努力）得到，获得；偶然得到。
as time went by是短语。
as time went by意思为随着时间的推移；随着时间的流逝，在句子中作时间状语。
关键词汇：as
音标：英[æz , əz] 美[æz , əz]
详细释义：
prep. 像; 如同; 作为; 当作;
adv. (比较时用)像…一样，如同; (指事情以同样的方式发生)和…一样;
conj. 当…时; 随着; 照…方式; 因为; 由于; 正如; 尽管;
短语搭配：
as a consequence;as a result 因此；作为结果
as usual 照常；像往常一样
just as 正当…之时
例句：
As time go by my memory seem to get worse.
随著时间的流逝，我的记忆力似乎越来越差。
As time went by we saw less and less of each other.
随着时间的推移，我们见面越来越少。
As time went by Fred became very sad.
日子一久,佛列德越来越难过。