<entry id="2210833" stat="A" corpus="jmdict" type="jmdict">
<ent_corp type="jmdict">jmdict</ent_corp>
<ent_seq>2786120</ent_seq>
<k_ele>
<keb>胸がすく</keb>
</k_ele>
<k_ele>
<keb>胸が空く</keb>
<ke_inf>&rK;</ke_inf>
</k_ele>
<r_ele>
<reb>むねがすく</reb>
</r_ele>
<sense>
<pos>&exp;</pos>
<pos>&v5k;</pos>
<gloss>to feel relieved</gloss>
<gloss>to feel satisfied</gloss>
<gloss>to feel refreshed</gloss>
</sense>
<info>
<audit time="2013-05-14 10:54:35" stat="A" unap="true">
<upd_name>Francis</upd_name>
<upd_detl>This was in the text which I was reading. Google hits are about 20k on my search. There does not seem to be any results where kanji is used. I assume that the kanji is "好く", but no search results which I have done confirm that.

You also have the following:-

胸がすく 【むねがすく】 feel refreshed; WI1</upd_detl>
<upd_refs>See below.</upd_refs>
</audit>
<audit time="2013-05-14 20:34:43" stat="A">
<upd_uid>rene</upd_uid>
<upd_name>Rene Malenfant</upd_name>
<upd_email>...address hidden...</upd_email>
<upd_refs>gg5, prog</upd_refs>
<upd_diff>@@ -12,1 +12,4 @@
-&lt;gloss&gt;to feel elated&lt;/gloss&gt;
+&lt;pos&gt;&amp;v5k;&lt;/pos&gt;
+&lt;gloss&gt;to feel relieved&lt;/gloss&gt;
+&lt;gloss&gt;to feel satisfied&lt;/gloss&gt;
+&lt;gloss&gt;to feel refreshed&lt;/gloss&gt;</upd_diff>
</audit>
<audit time="2022-10-04 00:48:57" stat="A" unap="true">
<upd_name>Stephen Kraus</upd_name>
<upd_email>...address hidden...</upd_email>
<upd_refs>Daijisen's third sense in its entry for 空く【すく】:
（「胸がすく」などの形で）つかえていたものがなくなり、すっとする。心がはれる。「胸の―・く思い」

Google N-gram Corpus Counts
╭─ーーーー─┬───────┬───────╮
│ 胸が空く │   350 │  3.6% │
│ 胸が好く │     0 │  0.0% │
│ 胸がすく │ 9,461 │ 96.4% │
╰─ーーーー─┴───────┴───────╯</upd_refs>
<upd_diff>@@ -5,0 +6,4 @@
+&lt;/k_ele&gt;
+&lt;k_ele&gt;
+&lt;keb&gt;胸が空く&lt;/keb&gt;
+&lt;ke_inf&gt;&amp;rK;&lt;/ke_inf&gt;</upd_diff>
</audit>
<audit time="2022-10-04 05:38:54" stat="A">
<upd_uid>jwb</upd_uid>
<upd_name>Jim Breen</upd_name>
<upd_email>...address hidden...</upd_email>
</audit>
</info>
</entry>