at/on sight

1. 一見（就）
   They had orders to shoot on sight.

   他們接到命令說見人就開槍。

at first sight

1. 初見；初看之下
   They fell in love as soon as they met: it was love at first sight.

   他們一見面就墜入情網，真是一見鍾情。

at (the) sight of

1. 一看見
   At the sight of the police officers they ran off.

   一看見那些警官，他們便逃跑了。

catch sight of

1. 看到
   I caught sight of her hurrying away but I didn't try to speak to her.

   我看見她匆忙走開，但我並沒有跟她講話。

in sight

1. 看得見
   No car is in sight.

   一輛汽車也看不見。

lose sight of

1. 不再看見
   I've lost sight of that bird.

   我看不到那隻鳥了。

out of sight

1. 看不見；目所不見之處
   The train was soon out of sight.

   那火車很快就看不見了。

2. 【口】（標準等）高得達不到
3. 好極了；太棒了；十全十美
   That birthday gift was really out of sight.

   那件生日禮物實在是太棒了。

   His new sports car is really out of sight.

   他的新跑車實在太棒了。

set one's sights on

1. 力求
   We have set our sights on a bigger house.

   我們一心想買幢大一點的房子。

• at first sight
  when first seen; from an initial impression.
• in sight
  
  1. visible.
  2. close to being achieved or realized.
• in (or within) sight of
  
  1. so as to see or be seen from.
  2. within reach of; close to attaining.
• in (or within) one's sights
  
  1. visible, especially through the sights of one's gun.
  2. within the scope of one's ambitions or expectations.
• lose sight of
  
  1. be no longer able to see.
  2. fail to consider, be aware of, or remember.
• on (or at) sight
  as soon as someone or something has been seen.
• out of sight
  
  1. not visible.
  2. (also outasight) informal extremely good; excellent.
• raise (or lower) one's sights
  become more (or less) ambitious; increase (or lower) one's expectations.
• set one's sights on
  hope strongly to achieve or reach.
• a sight ——
  informal indicating considerable extent:
  she is a sight cleverer than Sarah.
• a sight for sore eyes
  informal a person or thing that one is extremely pleased or relieved to see.
• a sight to behold
  a person or thing that is particularly impressive.